.d-target {
    width: 100px;
    height: 100px;
    border: 1px solid #ccc;
    border-radius: 50%;
    position: fixed;
    left: 30px;
    bottom: 30px;
}
.outer {
    width: 30px;
    height: 30px;
    position: absolute;
    left: 0px;
    top: 0px;
    transition: all 0.35s linear;
}
.outer .inner {
    width: 30px;
    height: 30px;
    background: #FB4E44;
    border-radius: 50%;
    transition: all 0.35s cubic-bezier(0.39, -0.4, 0.83, 0.23);
    position: absolute;
}
.outer.point-pre {
    display: none;
}